Medicine is the art Art is the process or product of deliberately arranging elements in a way that appeals to the senses or emotions. It encompasses a diverse range of human activities, creations, and modes of expression, including music and literature. The meaning of art is explored in a branch of philosophy known as aesthetics and science Science refers to any systematic knowledge-base or prescriptive practice that is capable of resulting in a prediction or predictable type of outcome. In this sense, science may refer to a highly skilled technique or practice of healing Healing, assessed physically, is the process by which the cells in the body regenerate and repair to reduce the size of a damaged or necrotic area. Healing incorporates both the removal of necrotic tissue , and the replacement of this tissue. It encompasses a range of health care Health care, or healthcare, refers to the treatment and management of illness, and the preservation of health through services offered by the medical, dental, pharmaceutical, clinical laboratory sciences , nursing, and allied health professions. Health care embraces all the goods and services designed to promote health, including “preventive, practices evolved to maintain and restore health Health is generally defined as being "a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity" according to the World Health Organization by the prevention In medicine, prevention is any activity which reduces the burden of mortality or morbidity from disease. This takes place at primary, secondary and tertiary prevention levels and treatment of illness It is sometimes considered a synonym for disease. Others maintain that fine distinctions exist. Some have described illness as the subjective perception by a patient of an objectively defined disease.

Contemporary medicine applies health science Health science is the applied science dealing with health, and it includes many subdisciplines. See also health science academic disciplines, biomedical research Biomedical research , in general simply known as medical research, is the basic research, applied research, or translational research conducted to aid the body of knowledge in the field of medicine. Medical research can be divided into two general categories: the evaluation of new treatments for both safety and efficacy in what are termed clinical, and medical technology Medical technology is a part of the Health technology which encompasses a wide range of health care products and, in one form or another, is used to diagnose, monitor or treat every disease or condition that affects humans. These innovative technologies are improving the quality of health care delivered and patient outcomes through earlier to diagnose In medicine, diagnosis is the process of identifying a medical condition or disease by its signs, symptoms, and from the results of various diagnostic procedures. The conclusion reached through this process is called a diagnosis. The term "diagnostic criteria" designates the combination of signs, symptoms, and test results that allows and treat injury Injury or bodily injury is damage or harm caused to the structure or function of the body caused by an outside agent or force, which may be physical or chemical, and either by accident or intentional. Personal Injury also refers to damage caused to the reputation of another rather than physical harm to the body. A severe and life-threatening and disease A disease or medical condition is an abnormal condition of an organism that impairs bodily functions, associated with specific symptoms and signs. It may be caused by external factors, such as invading organisms, or it may be caused by internal dysfunctions, such as autoimmune diseases, typically through medication A pharmaceutical drug, also referred to as medicine or medicament, can be loosely defined as any substance intended for use in the diagnosis, cure, mitigation, treatment, or prevention of disease. Other synonyms include pharmacotherapy, pharmacotherapeutics, and drug treatment, surgery Surgery is a medical specialty that uses operative manual and instrumental techniques on a patient to investigate and/or treat a pathological condition such as disease or injury, to help improve bodily function or appearance, or sometimes for some other reason. An act of performing surgery may be called a surgical procedure, operation, or simply, or some other form of therapy Therapy , or treatment, is the attempted remediation of a health problem, usually following a diagnosis. In the medical field, it is synonymous with the word "treatment". The word medicine is derived from the Latin Latin is an Italic language historically spoken in Latium and Ancient Rome. Through the Roman conquest, Latin spread throughout the Mediterranean and a large part of Europe. Romance languages such as Italian, French, Catalan, Romanian, Spanish, and Portuguese are descended from Latin, while many others, especially European languages, including ars medicina, meaning the art of healing.^[1][2]

Though medical technology and clinical expertise are pivotal to contemporary medicine, successful face-to-face relief of actual suffering Suffering, or pain, is an individual's basic affective experience of unpleasantness and aversion associated with harm or threat of harm. Suffering may be qualified as physical, or mental. It may come in all degrees of intensity, from mild to intolerable. Factors of duration and frequency of occurrence usually compound that of intensity. In continues to require the application of ordinary human feeling Feeling is the nominalization of "to feel". The word was first used in the English language to describe the physical sensation of touch either through experience or perception. The word is also used to describe experiences, other than the physical sensation of touch, such as "a feeling of warmth". In psychology the word is and compassion Compassion is a human emotion prompted by enduring pain with others. More vigorous than empathy, the feeling commonly gives rise to an active desire to alleviate another's suffering. It is often, though not inevitably, the key component in what manifests in the social context as altruism. In ethical terms, the various expressions down the ages of, known in English as bedside manner Bedside manner is a term describing how a healthcare professional handles a patient. A good bedside manner is typically one that reassures and comforts the patient. Vocal tones, body language, openness, presence, and concealment of attitude may all affect bedside manner. Poor bedside manner leaves the patient feeling unsatisfied, worried, alone,.^[3]

History

Prehistoric medicine Prehistoric medicine is a term used to describe the use of medicine before the invention of writing. As the invention of writing varies per culture and region, the term "prehistoric medicine" encompasses a wide range of time periods and dates, and should not be considered a set period in time incorporated plants (herbalism Herbalism is a traditional medicinal or folk medicine practice based on the use of plants and plant extracts. Herbalism is also known as botanical medicine, medical herbalism, herbal medicine, herbology, and phytotherapy. The scope of herbal medicine is sometimes extended to include fungal and bee products, as well as minerals, shells and certain), animal parts and minerals. In many cases these materials were used ritually as magical substances by priests A priest or priestess is a person having the authority or power to administer religious rites; in particular, rites of sacrifice to, and propitiation of, a deity or deities. Their office or position is the priesthood, a term which may also apply to such persons collectively, shamans, or medicine men "Medicine man" or "Medicine woman" are English terms used to describe Native American healers and spiritual figures. Anthropologists tend to prefer the term "shaman.". Well-known spiritual systems include animism Animism (from Latin anima ) is a philosophical, religious or spiritual idea that souls or spirits exist not only in humans and animals but also in plants, rocks, natural phenomena such as thunder, geographic features such as mountains or rivers, or other entities of the natural environment, a proposition also known as hylozoism in philosophy (the notion of inanimate objects having spirits), spiritualism Spiritualism developed in the United States and reached its peak growth in membership from the 1840s to the 1920s, especially in English-language countries, By 1897, it was said to have more than eight million followers in the United States and Europe, mostly drawn from the middle and upper classes, while the corresponding movement in Latin (an appeal to gods or communion with ancestor spirits); shamanism Shamanism comprises a range of traditional beliefs and practices concerned with communication with the spirit world. A practitioner of shamanism is known as a shaman, pronounced /ˈʃɑːmən/, /ˈʃeɪmən/, noun (pl. -man(s)). There are many variations of shamanism throughout the world, but several common beliefs are shared by all forms of (the vesting of an individual with mystic powers); and divination Divination is the attempt to gain insight into a question or situation by way of a standardized process or ritual. Diviners ascertain their interpretations of how a querent should proceed by reading signs, events, or omens, or through alleged contact with a supernatural agency. Divination can be seen as a systematic method with which to organize (magically obtaining the truth). The field of medical anthropology Medical anthropology is a subfield of social and cultural anthropology. It is a term which has been used since 1963 (Scotch, Norman A. Medical Anthropology. Introduction. Biennial Review of Anthropology) as a label for empirical research and theoretical production by anthropologists into the social processes and cultural representations of health, studies the various prehistoric Prehistory is a term used to describe the period before written history. Paul Tournal originally coined the term Pré-historique in describing the finds he had made in the caves of southern France.[citation needed] It came into use in French in the 1830s to describe the time before writing, and the word "prehistoric" was introduced into medical systems and their interaction with society.

Early records on medicine have been discovered from early Ayurvedic Ayurveda believes in five great Elements -- to compose the Universe, including the human body. Chyle, blood, flesh, fat, bone, marrow, and semen are believed to be the seven primary constituent elements (Devanāgarī: सप्तधातु) of the body. Ayurveda stresses a balance of three substances: wind/spirit/air, phlegm, and bile, each medicine in the Indian subcontinent South Asia, also known as Southern Asia, is the southern region of the Asian continent, which comprises the sub-Himalayan countries and, for some authorities , also includes the adjoining countries on the west and the east. It is surrounded (clockwise, from west to east) by Western Asia, Central Asia, Eastern Asia, Southeastern Asia and the Indian, ancient Egyptian medicine Ancient Egyptian Medicine refers to the practices of healing common in Ancient Egypt from circa 3300 BC until the Persian invasion of 523 BC. This medicine was highly advanced for the time, and included simple, non-invasive surgery, setting of bones and an extensive set of pharmacopoeia. While ancient Egyptian remedies are often characterized in, traditional Chinese medicine Traditional Chinese medicine, also known as TCM , includes a range of traditional medical practices originating in China. Although well accepted in the mainstream of medical care throughout East Asia, it is considered an alternative medical system in much of the western world and ancient Greek medicine The first known Greek medical school opened in Shalimar in 700 BC. Alcmaeon, author of the first anatomical work, worked at this school, and it was here that the practice of observing patients was established. Hippocrates established his own medical school at Cos. Despite their known respect for Egyptian medicine, attempts to discern any. Early Greek doctor Hippocrates Hippocrates of Cos or Hippokrates of Kos - Greek: Ἱπποκράτης; Hippokrátēs was an ancient Greek physician of the Age of Pericles, and was considered one of the most outstanding figures in the history of medicine. He is referred to as the "father of medicine" in recognition of his lasting contributions to the field as the, who is also called the Father of Medicine,^[4][5] and Galen Aelius Galenus or Claudius Galenus , better known as Galen of Pergamum (Greek: Γαληνός, Galēnos), was a prominent Roman physician and philosopher of Greek origin, and probably the most accomplished medical researcher of the Roman period. His theories dominated and influenced Western medical science for well over a millennium. His account laid a foundation for later developments in a rational approach to medicine. After the fall of Rome and the onset of the Dark Ages The concept of a Dark Age was created by the Italian scholar Petrarch in the 1330s as an age which separated his own from the riches of classical antiquity and was originally intended as a sweeping criticism of the character of Late Latin literature. Later historians expanded the term to refer to the transitional period between Classical Roman in Western Europe, the Greek tradition of medicine went into decline. After 750, the Muslim Arab world had Galen and Aristotle's works translated into Arabic, and Islamic physicians In the history of medicine, Islamic medicine or Arabic medicine refers to medicine developed in the medieval Islamic civilization and written in Arabic, the lingua franca of the Islamic civilization. Despite these names, a significant number of scientists during this period were not Arab. Some consider the label "Arab-Islamic" as engaged in some significant medical research. Notable Islamic medical pioneers include polymath A polymath is a person whose expertise fills a significant number of subject areas. In less formal terms, a polymath (or polymathic person) may simply refer to someone who is very knowledgeable. Most ancient scientists were polymaths by today’s standards Avicenna Abū ‘Alī al-Ḥusayn ibn ‘Abd Allāh ibn Sīnā', known as Abū Alī Sīnā or Ibn Sīnā (Arabic: ابن سینا‎), and commonly known in English by his Latinized name Avicenna (Greek: Aβιτζιανός, Abitzianos), (c. 980 - 1037) was a Persian polymath and the foremost physician and philosopher of his time. He was also an astronomer,, who, along with Hippocrates, has also been called the Father of Medicine,^[6][7] Abulcasis Abu al-Qasim Khalaf ibn al-Abbas Al-Zahrawi, (Arabic: أبو القاسم بن خلف بن العباس الزهراوي‎) also known in the West as Abulcasis, was an Andalusian physician, surgeon, chemist, cosmetologist, and scientist. He is considered the father of modern surgery, and as Islam's greatest medieval surgeon, whose comprehensive, the father of surgery, Avenzoar Abū Merwān ’Abdal-Malik ibn Zuhr (also known as Ibn Zuhr, Avenzoar, Abumeron or Ibn-Zohr) (1091–1161) was an Arab Muslim physician, pharmacist, surgeon, parasitologist, Islamic scholar, and teacher, the father of experimental surgery, Ibn al-Nafis Ibn al-Nafis is now most famous for being the first physician to describe the pulmonary transit of blood. His discovery disproved the 1000 year-old theory of Galen who suggested invisible pores in the intraventricular septum. Ibn Nafis clearly stated that the "blood in the right ventricle of the heart must reach the lest ventricule by way of, the father of circulatory physiology, and Averroes Abū 'l-Walīd Muḥammad ibn Aḥmad ibn Rushd , better known just as Ibn Rushd (Arabic: ابن رشد‎), and in European literature as Averroes (pronounced /əˈvɛroʊ.iːz/) (1126 – December 10, 1198), was an Andalusian-Arab Muslim polymath: a master of Islamic philosophy, Islamic theology, Maliki law and jurisprudence, logic, psychology,.^[8] Rhazes Abū Bakr Muhammad ibn Zakariyā Rāzī , known as Rhazes or Rasis after medieval Latinists, (August 26 865, Rayy— 925, Rayy) was a Persian alchemist, chemist, physician, philosopher and scholar. He is recognised as a polymath and often referred as "probably the greatest and most original of all the Muslim physicians, and one of the most, who is called the father of pediatrics, was one of first to question the Greek theory of humorism, which nevertheless remained influential in both medieval Western and medieval Islamic medicine ^[9] During the Crusades, one Muslim observer famously expressed a dim view of contemporary Western medicine. ^[10] However, overall mortality and mordibity levels in the medieval Middle East and medieval Europe did not significantly differ one from the other, which indicates that there was no major medical "breakthrough" to modern medicine in either region in this period. The fourteenth and fifteenth Black Death was just as devastating to the Middle East as to Europe, and it has even been argued that Western Europe was generally more effective in recovering from the pandemic than the Midddle East. ^[11] As the medieval ages ended, important early figures in medicine emerged in Europe, including Gabriele Falloppio and William Harvey.

The major shift in medical thinking was the gradual rejection, especially during the Black Death in the 14th and 15th centuries, of what may be called the 'traditional authority' approach to science and medicine. This was the notion that because some prominent person in the past said something must be so, then that was the way it was, and anything one observed to the contrary was an anomaly (which was paralleled by a similar shift in European society in general - see Copernicus's rejection of Ptolemy's theories on astronomy). Physicians like Ibn al-Nafis and Vesalius led the way in improving upon or indeed rejecting the theories of great authorities from the past (such as Hippocrates, and Galen), many of whose theories were in time discredited.

Modern scientific biomedical research (where results are testable and reproducible) began to replace early Western traditions based on herbalism, the Greek "four humours" and other such pre-modern notions. The modern era really began with Robert Koch's discoveries around 1880 of the transmission of disease by bacteria, and then the discovery of antibiotics around 1900. The post-18th century modernity period brought more groundbreaking researchers from Europe. From Germany and Austrian doctors such as Rudolf Virchow, Wilhelm Conrad Röntgen, Karl Landsteiner, and Otto Loewi) made contributions. In the United Kingdom Alexander Fleming, Joseph Lister, Francis Crick, and Florence Nightingale are considered important. From New Zealand and Australia came Maurice Wilkins, Howard Florey, and Frank Macfarlane Burnet). In the United States William Williams Keen, Harvey Cushing, William Coley, James D. Watson, Italy (Salvador Luria), Switzerland (Alexandre Yersin), Japan (Kitasato Shibasaburo), and France (Jean-Martin Charcot, Claude Bernard, Paul Broca and others did significant work. Russian (Nikolai Korotkov also did significant work, as did Sir William Osler and Harvey Cushing.

As science and technology developed, medicine became more reliant upon medications. Pharmacology developed from herbalism and many drugs are still derived from plants (atropine, ephedrine, warfarin, aspirin, digoxin, vinca alkaloids, taxol, hyoscine, etc). The first of these was arsphenamine / Salvarsan discovered by Paul Ehrlich in 1908 after he observed that bacteria took up toxic dyes that human cells did not. Vaccines were discovered by Edward Jenner and Louis Pasteur. The first major class of antibiotics was the sulfa drugs, derived by French chemists originally from azo dyes. This has become increasingly sophisticated; modern biotechnology allows drugs targeted towards specific physiological processes to be developed, sometimes designed for compatibility with the body to reduce side-effects. Genomics and knowledge of human genetics is having some influence on medicine, as the causative genes of most monogenic genetic disorders have now been identified, and the development of techniques in molecular biology and genetics are influencing medical technology, practice and decision-making.

Evidence-based medicine is a contemporary movement to establish the most effective algorithms of practice (ways of doing things) through the use of systematic reviews and meta-analysis. The movement is facilitated by the modern global information science, which allows all evidence to be collected and analyzed according to standard protocols which are then disseminated to healthcare providers. One problem with this 'best practice' approach is that it could be seen to stifle novel approaches to treatment. The Cochrane Collaboration leads this movement. A 2001 review of 160 Cochrane systematic reviews revealed that, according to two readers, 21.3% of the reviews concluded insufficient evidence, 20% concluded evidence of no effect, and 22.5% concluded positive effect.^[12]

Clinical practice

In clinical practice doctors personally assess patients in order to diagnose, treat, and prevent disease using clinical judgment. The doctor-patient relationship typically begins an interaction with an examination of the patient's medical history and medical record, followed a medical interview^[13] and a physical examination. Basic diagnostic medical devices (e.g. stethoscope, tongue depressor) are typically used. After examination for signs and interviewing for symptoms, the doctor may order medical tests (e.g. blood tests), take a biopsy, or prescribe pharmaceutical drugs or other therapies. Differential diagnosis methods help to rule out conditions based on the information provided. During the encounter, properly informing the patient of all relevant facts is an important part of the relationship and the development of trust. The medical encounter is then documented in the medical record, which is a legal document in many jurisdictions.^[14] Followups may be shorter but follow the same general procedure.

The components of the medical interview^[13] and encounter are:

• Chief complaint (cc): the reason for the current medical visit. These are the 'symptoms.' They are in the patient's own words and are recorded along with the duration of each one. Also called 'presenting complaint.'
• History of present illness / complaint (HPI): the chronological order of events of symptoms and further clarification of each symptom.
• Current activity: occupation, hobbies, what the patient actually does.
• Medications (Rx): what drugs the patient takes including prescribed, over-the-counter, and home remedies, as well as alternative and herbal medicines/herbal remedies. Allergies are also recorded.
• Past medical history (PMH/PMHx): concurrent medical problems, past hospitalizations and operations, injuries, past infectious diseases and/or vaccinations, history of known allergies.
• Social history (SH): birthplace, residences, marital history, social and economic status, habits (including diet, medications, tobacco, alcohol).
• Family history (FH): listing of diseases in the family that may impact the patient. A family tree is sometimes used.

• Review of systems (ROS) or systems inquiry: a set of additional questions to ask which may be missed on HPI: a general enquiry (have you noticed any weight loss, change in sleep quality, fevers, lumps and bumps? etc), followed by questions on the body's main organ systems (heart, lungs, digestive tract, urinary tract, etc).

The physical examination is the examination of the patient looking for signs of disease ('Symptoms' are what the patient volunteers, 'Signs' are what the healthcare provider detects by examination). The healthcare provider uses the senses of sight, hearing, touch, and sometimes smell (taste has been made redundant by the availability of modern lab tests). Four chief methods are used: inspection, palpation (feel), percussion (tap to determine resonance characteristics), and auscultation (listen); smelling may be useful (e.g. infection, uremia, diabetic ketoacidosis). The clinical examination involves study of:

• Vital signs including height, weight, body temperature, blood pressure, pulse, respiration rate, hemoglobin oxygen saturation
• General appearance of the patient and specific indicators of disease (nutritional status, presence of jaundice, pallor or clubbing)
• Skin
• Head, eye, ear, nose, and throat (HEENT)
• Cardiovascular (heart and blood vessels)
• Respiratory (large airways and lungs)
• Abdomen and rectum
• Genitalia (and pregnancy if the patient is or could be pregnant)
• Musculoskeletal (including spine and extremities)
• Neurological (consciousness, awareness, brain, vision, cranial nerves, spinal cord and peripheral nerves)
• Psychiatric (orientation, mental state, evidence of abnormal perception or thought)

Laboratory and imaging studies results may be obtained, if necessary.

The medical decision-making (MDM) process involves analysis and synthesis of all the above data to come up with a list of possible diagnoses (the differential diagnoses), along with an idea of what needs to be done to obtain a definitive diagnosis that would explain the patient's problem.

The treatment plan may include ordering additional laboratory tests and studies, starting therapy, referral to a specialist, or watchful observation. Follow-up may be advised.

This process is used by primary care providers as well as specialists. It may take only a few minutes if the problem is simple and straightforward. On the other hand, it may take weeks in a patient who has been hospitalized with bizarre symptoms or multi-system problems, with involvement by several specialists.

On subsequent visits, the process may be repeated in an abbreviated manner to obtain any new history, symptoms, physical findings, and lab or imaging results or specialist consultations.

Institutions

Contemporary medicine is in general conducted within health care systems. Legal, credentialing and financing frameworks are established by individual governments, augmented on occasion by international organizations. The characteristics of any given health care system have significant impact on the way medical care is provided.

Advanced industrial countries (with the exception of the United States) ^[15][16] and many developing countries provide medical services though a system of universal health care which aims to guarantee care for all through a single-payer health care system, or compulsory private or co-operative health insurance. This is intended to ensure that the entire population has access to medical care on the basis of need rather than ability to pay. Delivery may be via private medical practices or by state-owned hospitals and clinics, or by charities; most commonly by a combination of all three.

Most tribal societies, but also some communist countries (e.g. China) and the United States,^[15][16] provide no guarantee of health care for the population as a whole. In such societies, health care is available to those that can afford to pay for it or have self insured it (either directly or as part of an employment contract) or who may be covered by care financed by the government or tribe directly.

Transparency of information is another factor defining a delivery system. Access to information on conditions, treatments, quality and pricing greatly affects the choice by patients / consumers and therefore the incentives of medical professionals. While the US health care system has come under fire for lack of openness,^[17] new legislation may encourage greater openness. There is a perceived tension between the need for transparency on the one hand and such issues as patient confidentiality and the possible exploitation of information for commercial gain on the other.

Delivery

Provision of medical care is classified into primary, secondary and tertiary care categories.

Primary care medical services are provided by physicians, physician assistants, or other health professionals who have first contact with a patient seeking medical treatment or care. These occur in physician offices, clinics, nursing homes, schools, home visits and other places close to patients. About 90% of medical visits can be treated by the primary care provider. These include treatment of acute and chronic illnesses, preventive care and health education for all ages and both sexes.

Secondary care medical services are provided by medical specialists in their offices or clinics or at local community hospitals for a patient referred by a primary care provider who first diagnosed or treated the patient. Referrals are made for those patients who required the expertise or procedures performed by specialists. These include both ambulatory care and inpatient services, emergency rooms, intensive care medicine, surgery services, physical therapy, labor and delivery, endoscopy units, diagnostic laboratory and medical imaging services, hospice centers, etc. Some primary care providers may also take care of hospitalized patients and deliver babies in a secondary care setting.

Tertiary care medical services are provided by specialist hospitals or regional centers equipped with diagnostic and treatment facilities not generally available at local hospitals. These include trauma centers, burn treatment centers, advanced neonatology unit services, organ transplants, high-risk pregnancy, radiation oncology, etc.

Modern medical care also depends on information - still delivered in many health care settings on paper records, but increasingly nowadays by electronic means.

Branches

Working together as an interdisciplinary team, many highly-trained health professionals besides medical practitioners are involved in the delivery of modern health care. Examples include: nurses, emergency medical technicians and paramedics, laboratory scientists, (pharmacy, pharmacists), (physiotherapy,physiotherapists), respiratory therapists, speech therapists, occupational therapists, radiographers, dietitians and bioengineers.

The scope and sciences underpinning human medicine overlap many other fields. Dentistry, while a separate discipline from medicine, is considered a medical field.

A patient admitted to hospital is usually under the care of a specific team based on their main presenting problem, e.g. the Cardiology team, who then may interact with other specialties, e.g. surgical, radiology, to help diagnose or treat the main problem or any subsequent complications / developments.

Physicians have many specializations and subspecializations into certain branches of medicine, which are listed below. There are variations from country to country regarding which specialties certain subspecialties are in.

The main branches of medicine used in Wikipedia are:

• Basic sciences of medicine; this is what every physician is educated in, and some return to in biomedical research.
• Medical specialties
• interdisciplinary fields, where different medical specialties are mixed to function in certain occasions.

Basic sciences

• Anatomy is the study of the physical structure of organisms. In contrast to macroscopic or gross anatomy, cytology and histology are concerned with microscopic structures.
• Biochemistry is the study of the chemistry taking place in living organisms, especially the structure and function of their chemical components.
• Biostatistics is the application of statistics to biological fields in the broadest sense. A knowledge of biostatistics is essential in the planning, evaluation, and interpretation of medical research. It is also fundamental to epidemiology and evidence-based medicine.
• Cytology is the microscopic study of individual cells.
• Embryology is the study of the early development of organisms.
• Epidemiology is the study of the demographics of disease processes, and includes, but is not limited to, the study of epidemics.
• Genetics is the study of genes, and their role in biological inheritance.
• Histology is the study of the structures of biological tissues by light microscopy, electron microscopy and immunohistochemistry.
• Immunology is the study of the immune system, which includes the innate and adaptive immune system in humans, for example.
• Medical physics is the study of the applications of physics principles in medicine.
• Microbiology is the study of microorganisms, including protozoa, bacteria, fungi, and viruses.
• Neuroscience includes those disciplines of science that are related to the study of the nervous system. A main focus of neuroscience is the biology and physiology of the human brain and spinal cord.
• Nutrition science (theoretical focus) and dietetics (practical focus) is the study of the relationship of food and drink to health and disease, especially in determining an optimal diet. Medical nutrition therapy is done by dietitians and is prescribed for diabetes, cardiovascular diseases, weight and eating disorders, allergies, malnutrition, and neoplastic diseases.
• Pathology as a science is the study of disease—the causes, course, progression and resolution thereof.
• Pharmacology is the study of drugs and their actions.
• Physiology is the study of the normal functioning of the body and the underlying regulatory mechanisms.
• Toxicology is the study of hazardous effects of drugs and poisons.

Specialties

In the broadest meaning of "medicine", there are many different specialties. However, within medical circles, there are two broad categories: "Medicine" and "Surgery." "Medicine" refers to the practice of non-operative medicine, and most subspecialties in this area require preliminary training in "Internal Medicine". "Surgery" refers to the practice of operative medicine, and most subspecialties in this area require preliminary training in "General Surgery." There are some specialties of medicine that do not fit into either of these categories, such as radiology, pathology, or anesthesia, and those are also discussed further below.

Surgery

Surgical specialties employ operative treatment. In addition, surgeons must decide when an operation is necessary, and also treat many non-surgical issues, particularly in the surgical intensive care unit (SICU), where a variety of critical issues arise. Surgery has many subspecialties, e.g. general surgery,Transplant surgery, trauma surgery, cardiovascular surgery, neurosurgery, maxillofacial surgery, orthopedic surgery, otolaryngology, plastic surgery, oncologic surgery, vascular surgery, and pediatric surgery. In some centers, anesthesiology is part of the division of surgery (for logistical and planning purposes), although it is not a surgical discipline.

Surgical training in the U.S. requires a minimum of five years of residency after medical school. Sub-specialties of surgery often require seven or more years. In addition, fellowships can last an additional one to three years. Because post-residency fellowships can be competitive, many trainees devote two additional years to research. Thus in some cases surgical training will not finish until more than a decade after medical school. Furthermore, surgical training can be very difficult and time consuming.

'Medicine' as a specialty

Internal medicine is the medical specialty concerned with the diagnosis, management and nonsurgical treatment of unusual or serious diseases, either of one particular organ system or of the body as a whole. According to some sources, an emphasis on internal structures is implied.^[18] In North America, specialists in internal medicine are commonly called "internists". Elsewhere, especially in Commonwealth nations, such specialists are often called physicians.^[19] These terms, internist or physician (in the narrow sense, common outside North America), generally exclude practitioners of gynecology and obstetrics, pathology, psychiatry, and especially surgery and its subspecialities.

Because their patients are often seriously ill or require complex investigations, internists do much of their work in hospitals. Formerly, many internists were not subspecialized; such general physicians would see any complex nonsurgical problem; this style of practice has become much less common. In modern urban practice, most internists are subspecialists: that is, they generally limit their medical practice to problems of one organ system or to one particular area of medical knowledge. For example, gastroenterologists and nephrologists specialize respectively in diseases of the gut and the kidneys.^[20]

In Commonwealth and some other countries, specialist pediatricians and geriatricians are also described as specialist physicians (or internists) who have subspecialized by age of patient rather than by organ system. Elsewhere, especially in North America, general pediatrics is often a form of Primary care.

There are many subspecialities (or subdisciplines) of internal medicine:

• Cardiology
• Critical care medicine
• Dermatology
• Endocrinology
• Gastroenterology
• Geriatrics
• Hematology
• Hepatology
• Infectious diseases
• Nephrology
• Neurology
• Oncology
• Pediatrics
• Pulmonology
• Rheumatology
• Sleep medicine

Training in internal medicine (as opposed to surgical training), varies considerably across the world: see the articles on Medical education and Physician for more details. In North America, it requires at least three years of residency training after medical school, which can then be followed by a one to three year fellowship in the subspecialties listed above. In general, resident work hours in medicine are less than those in surgery, averaging about 60 hours per week in the USA.

Diagnostic specialties

• Clinical laboratory sciences are the clinical diagnostic services which apply laboratory techniques to diagnosis and management of patients. In the United States these services are supervised by a pathologist. The personnel that work in these medical laboratory departments are technically trained staff who do not hold medical degrees, but who usually hold an undergraduate medical technology degree, who actually perform the tests, assays, and procedures needed for providing the specific services. Subspecialties include Transfusion medicine, Cellular pathology, Clinical chemistry, Hematology, Clinical microbiology and Clinical immunology.
• Pathology as a medical specialty is the branch of medicine that deals with the study of diseases and the morphologic, physiologic changes produced by them. As a diagnostic specialty, pathology can be considered the basis of modern scientific medical knowledge and plays a large role in evidence-based medicine. Many modern molecular tests such as flow cytometry, polymerase chain reaction (PCR), immunohistochemistry, cytogenetics, gene rearrangements studies and fluorescent in situ hybridization (FISH) fall within the territory of pathology.
• Radiology is concerned with imaging of the human body, e.g. by x-rays, x-ray computed tomography, ultrasonography, and nuclear magnetic resonance tomography.
• Clinical neurophysiology is concerned with testing the physiology or function of the central and peripheral aspects of the nervous system. These kinds of tests can be divided into recordings of: (1) spontaneous or continuously running electrical activity, or (2) stimulus evoked responses. Subspecialties include Electroencephalography, Electromyography, Evoked potential, Nerve conduction study and Polysomnography. Sometimes these tests are performed by techs without a medical degree, but the interpretation of these tests is done by a medical professional.

Other

Following are some selected fields of medical specialties that don't directly fit into any of the above mentioned groups.

• Ophthalmology exclusively concerned with the eye and ocular adnexa, combining conservative and surgical therapy.
• Dermatology is concerned with the skin and its diseases. In the UK, dermatology is a subspecialty of general medicine.
• Emergency medicine is concerned with the diagnosis and treatment of acute or life-threatening conditions, including trauma, surgical, medical, pediatric, and psychiatric emergencies.
• Obstetrics and gynecology (often abbreviated as OB/GYN (American English) or Obs & Gynae (British English)) are concerned respectively with childbirth and the female reproductive and associated organs. Reproductive medicine and fertility medicine are generally practiced by gynecological specialists.
• Palliative care is a relatively modern branch of clinical medicine that deals with pain and symptom relief and emotional support in patients with terminal illnesses including cancer and heart failure.
• Pediatrics (AE) or paediatrics (BE) is devoted to the care of infants, children, and adolescents. Like internal medicine, there are many pediatric subspecialties for specific age ranges, organ systems, disease classes, and sites of care delivery.
• Physical medicine and rehabilitation (or physiatry) is concerned with functional improvement after injury, illness, or congenital disorders.
• Psychiatry is the branch of medicine concerned with the bio-psycho-social study of the etiology, diagnosis, treatment and prevention of cognitive, perceptual, emotional and behavioral disorders. Related non-medical fields include psychotherapy and clinical psychology.

Interdisciplinary fields

Interdisciplinary sub-specialties of medicine are:

• General practice, family practice, family medicine or primary care is, in many countries, the first port-of-call for patients with non-emergency medical problems.
• Many other health science fields, e.g. dietetics
• Bioethics is a field of study which concerns the relationship between biology, science, medicine and ethics, philosophy and theology.
• Biomedical Engineering is a field dealing with the application of engineering principles to medical practice.
• Clinical pharmacology is concerned with how systems of therapeutics interact with patients.
• Conservation medicine studies the relationship between human and animal health, and environmental conditions. Also known as ecological medicine, environmental medicine, or medical geology.
• Disaster medicine deals with medical aspects of emergency preparedness, disaster mitigation and management.
• Diving medicine (or hyperbaric medicine) is the prevention and treatment of diving-related problems.
• Evolutionary medicine is a perspective on medicine derived through applying evolutionary theory.
• Forensic medicine deals with medical questions in legal context, such as determination of the time and cause of death.
• Gender-based medicine studies the biological and physiological differences between the human sexes and how that affects differences in disease.
• Hospital medicine is the general medical care of hospitalized patients. Physicians whose primary professional focus is hospital medicine are called hospitalists in the USA.
• Medical humanities includes the humanities (literature, philosophy, ethics, history and religion), social science (anthropology, cultural studies, psychology, sociology), and the arts (literature, theater, film, and visual arts) and their application to medical education and practice.
• Medical informatics, medical computer science, medical information and eHealth are relatively recent fields that deal with the application of computers and information technology to medicine.
• Nosology is the classification of diseases for various purposes.
• Nosokinetics is the science/subject of measuring and modelling the process of care in health and social care systems.
• Pain management (also called pain medicine) is the medical discipline concerned with the relief of pain.
• Preventive medicine is the branch of medicine concerned with preventing disease.
  • Community health or public health is an aspect of health services concerned with threats to the overall health of a community based on population health analysis.
  • Occupational medicine's principal role is the provision of health advice to organizations and individuals to ensure that the highest standards of health and safety at work can be achieved and maintained.
  • Aerospace medicine deals with medical problems related to flying and space travel.
• Osteopathic medicine, a branch of the U.S. medical profession.
• Pharmacogenomics is a form of individualized medicine.
• Sports medicine deals with the treatment and preventive care of athletes, amateur and professional. The team includes specialty physicians and surgeons, athletic trainers, physical therapists, coaches, other personnel, and, of course, the athlete.
• Therapeutics is the field, more commonly referenced in earlier periods of history, of the various remedies that can be used to treat disease and promote health [3].
• Travel medicine or emporiatrics deals with health problems of international travelers or travelers across highly different environments.
• Urgent care focuses on delivery of unscheduled, walk-in care outside of the hospital emergency department for injuries and illnesses that are not severe enough to require care in an emergency department. In some jurisdictions this function is combined with the emergency room.
• Veterinary medicine; veterinarians apply similar techniques as physicians to the care of animals.
• Wilderness medicine; its about practice of medicine in the wild ,where conventional medical facilities may not be available.

Education

Medical education and training varies around the world. It typically involves entry level education at a university medical school, followed by a period of supervised practice or internship, and/or residency. This can be followed by postgraduate vocational training. A variety of teaching methods have been employed in medical education, still itself a focus of active research.

Many regulatory authorities require continuing medical education, since knowledge, techniques and medical technology continue to evolve at a rapid rate.

Legal controls

In most countries, it is a legal requirement for a medical doctor to be licensed or registered. In general, this entails a medical degree from a university and accreditation by a medical board or an equivalent national organization, which may ask the applicant to pass exams. This restricts the considerable legal authority of the medical profession to physicians that are trained and qualified by national standards. It is also intended as an assurance to patients and as a safeguard against charlatans that practice inadequate medicine for personal gain. While the laws generally require medical doctors to be trained in "evidence based", Western, or Hippocratic Medicine, they are not intended to discourage different paradigms of health.

Doctors who are negligent or intentionally harmful in their care of patients can face charges of medical malpractice and be subject to civil, criminal, or professional sanctions.

Statute of limitations

There is only a limited time during which a medical malpractice lawsuit can be filed. In the USA and Canada, these statute of limitations laws vary between 1 and 4 years (see Medical malpractice for more information).

Controversy

The Catholic social theorist Ivan Illich subjected contemporary western medicine to detailed attack in his Medical Nemesis, first published in 1975. He argued that the medicalization in recent decades of so many of life's vicissitudes — birth and death, for example — frequently caused more harm than good and rendered many people in effect lifelong patients. He marshalled a body of statistics to show what he considered the shocking extent of post-operative side-effects and drug-induced illness in advanced industrial society. He was the first to introduce to a wider public the notion of iatrogenesis.^[21] Others have since voiced similar views, but none so trenchantly, perhaps, as Illich. ^[22]

Through the course of the twentieth century, healthcare providers focused increasingly on the technology that was enabling them to make dramatic improvements in patients' health. The ensuing development of a more mechanistic, detached practice, with the perception of an attendant loss of patient-focused care, known as the medical model of health, led to criticisms that medicine was neglecting a holistic model.^{[citation needed]} The inability of modern medicine to properly address some common complaints continues to prompt many people to seek support from alternative medicine. Although most alternative approaches lack scientific validation, some, notably acupuncture for some conditions and certain herbs, are backed by evidence.^[23]

Medical errors and overmedication are also the focus of complaints and negative coverage. Practitioners of human factors engineering believe that there is much that medicine may usefully gain by emulating concepts in aviation safety, where it is recognized that it is dangerous to place too much responsibility on one "superhuman" individual and expect him or her not to make errors. Reporting systems and checking mechanisms are becoming more common in identifying sources of error and improving practice. Clinical versus statistical, algorithmic diagnostic methods were famously examined in psychiatric practice in a 1954 book by Paul E. Meehl, which controversially found statistical methods superior.^[24] A 2000 meta-analysis comparing these methods in both psychology and medicine found that statistical or "mechanical" diagnostic methods were generally, although not always, superior.^[24]

Disparities in quality of care given are often an additional cause of controversy.^[25] For example, elderly mentally ill patients received poorer care during hospitalization in a 2008 study.^[26] Rural poor African-American men were used in a study of syphilis that denied them basic medical care.

See also

• List of causes of death by rate
• List of diseases
• List of disorders
• List of important publications in medicine
• Medical Encyclopedia
• Medical equipment
• Medical literature
• Pharmacognosy
• Timeline of medicine and medical technology

References

1. ^ Etymology: Latin: medicina, from ars medicina "the medical art," from medicus "physician."(Etym.Online) Cf. mederi "to heal," etym. "know the best course for," from PIE base *med- "to measure, limit. Cf. Greek medos "counsel, plan," Avestan vi-mad "physician")
2. ^ "Medicine" Online Etymology Dictionary
3. ^ Culliford Larry (December 2002). "Spirituality and clinical care (Editorial)". British Medical Journal 325 (7378): 1434. doi:10.1136/bmj.325.7378.1434. PMID 12493652.
4. ^ Useful known and unknown views of the father of modern medicine, Hippocrates and his teacher Democritus., U.S. National Library of Medicine
5. ^ The father of modern medicine: the first research of the physical factor of tetanus, European Society of Clinical Microbiology and Infectious Diseases
6. ^ Becka J (1980). "The father of medicine, Avicenna, in our science and culture: Abu Ali ibn Sina (980-1037) (Czech title: Otec lékarů Avicenna v nasí vĕdĕ a kulture)" (in Czech). Cas Lek Cesk 119 (1): 17–23. PMID 6989499.
7. ^ Medical Practitioners
8. ^ Martín-Araguz A, Bustamante-Martínez C, Fernández-Armayor Ajo V, Moreno-Martínez JM (2002-05-01—15). "Neuroscience in al-Andalus and its influence on medieval scholastic medicine" (in Spanish). Revista de neurología 34 (9): 877–892. PMID 12134355.
9. ^ On the dominance of the Greek humoral theory, which was the basis for the practice of bloodletting, in medieval Islamic medicine see Peter E. Pormann and E. Savage Smith,Medieval Islamic medicine, Georgetown University, Washington DC, 2007 p. 10, 43-45.
10. ^ "Medieval Sourcebook: Usmah Ibn Munqidh (1095-1188): Autobiography, excerpts on the Franks". Fordham.edu. http://www.fordham.edu/halsall/source/usamah2.html. Retrieved on 2009-05-04.
11. ^ Michael Dols has shown that the Black Death was much more commonly believed by European authorities than by Middle Eastern authorities to be contagious; as a result, flight was more commonly counseled, and in urban Italy, quarantines were organized on a much wider level than in urban Egypt or Syria (The Black Death in the Middle East Princeton, 1977, p. 119; 285-290.
12. ^ Ezzo J, Bausell B, Moerman DE, Berman B, Hadhazy V (2001). "Reviewing the reviews. How strong is the evidence? How clear are the conclusions?". Int J Technol Assess Health Care 17 (4): 457–466. PMID 11758290.
13. ^ ^{a b} Coulehan JL, Block MR (2005). The Medical Interview: Mastering Skills for Clinical Practice (5th ed.). F. A. Davis. ISBN 0-8036-1246-X. OCLC 232304023.
14. ^ Addison K, Braden JH, Cupp JE, Emmert D, et al. (AHIMA e-HIM Work Group on the Legal Health Record) (September 2005). "Update: Guidelines for Defining the Legal Health Record for Disclosure Purposes". Journal of AHIMA 78 (8): 64A–G. PMID 16245584. http://library.ahima.org/xpedio/groups/public/documents/ahima/bok1_027921.hcsp?dDocName=bok1_027921.
15. ^ ^{a b} Insuring America's Health: Principles and Recommendations, Institute of Medicine at the National Academies of Science, 2004-01-14
16. ^ ^{a b} "The Case For Single Payer, Universal Health Care For The United States". Cthealth.server101.com. http://cthealth.server101.com/the_case_for_universal_health_care_in_the_united_states.htm. Retrieved on 2009-05-04.
17. ^ Martin Sipkoff (January 2004). "Transparency called key to uniting cost control, quality improvement". Managed Care. http://www.managedcaremag.com/archives/0401/0401.forum.html.
18. ^ internal medicine at Dorland's Medical Dictionary
19. ^ A Dictionary of Modern English Usage (Wordsworth Collection) (Wordsworth Collection). NTC/Contemporary Publishing Company. ISBN 1853263184.
20. ^ "The Royal Australasian College of Physicians: What are Physicians?". Royal Australasian College of Physicians. http://www.racp.edu.au/index.cfm?objectid=49EF1EB5-2A57-5487-D74DBAFBAE9143A3. Retrieved on 2008-02-05.
21. ^ Illich Ivan (1974). Medical Nemesis. London: Calder & Boyars. ISBN 0714510963. OCLC 224760852.
22. ^ [[Neil Postman |Postman Neil]] (1992). Technopoly: The Surrender of Culture to Technology. New York: Knopf. OCLC 24694343.
23. ^ The HealthWatch Award 2005: Prof. Edzard Ernst, Complementary medicine: the good the bad and the ugly.'.' Retrieved 5 August 2006.
24. ^ ^{a b} Grove WH, Zald DH, Lebow BS, Snitz BE, Nelson C. (2000). "Clinical versus mechanical prediction: A meta-analysis" (w). Psychological Assessment 12 (1): 19–30. doi:10.1037/1040-3590.12.1.19. http://www.psych.umn.edu/faculty/grove/096clinicalversusmechanicalprediction.pdf.
25. ^ "Eliminating Health Disparities". American Medical Association. http://www.ama-assn.org/ama/pub/physician-resources/public-health/eliminating-health-disparities.shtml.
26. ^ "[[1] Mental Disorders, Quality of Care, and Outcomes Among Older Patients Hospitalized With Heart Failure]". [2].

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